What happens after earning the 4 keys of an item ?

[Winnipoox]

Hello ! My id is winnipoox and i enjoy citystory !

I noticed that once you earned all the 4 keys of a contract item, you keep earning keys when you contract on the same item. I was wondering if these keys where still usefull and if you could earn more key steps on the item ?

Thank you for your answers and keep cleaning ! ;-)

[add onipad]

No the key's don't do anything. You do earn a 5% coin bonus which is only useful if you in need of coins.

Move on to the next contract

Please add onipad

[Unregistered]

Added ! Thank you for your answer !

[Unregistered]

You gain 50 000 $ and a river too